Cloudflared sometimes respond HTTP Status 200 with empty body

Zero Trust Cloudflare Tunnel
1

Hi, we use Cloudflare tunnel which accept Github webhook into our internal network.
In many cases, it works fine, but sometimes(n times per day) Github recorded 200 status code with Cf-Ray ID response header and empty response body.

However, we cannot find any network trafiic from cloudflared to backend about it, and Cf-Ray ID was not recorded in cloudflared log.
Cloudflared is running with the below setting, so I think if some traffic come into cloudflared, it will be reorded in log.

  • TUNNEL_LOGLEVEL: debug
  • TUNNEL_PROTO_LOGLEVEL: debug

I wonder which component return Cf-Ray ID and 200 HTTP status and empty body.
I suspect Cloudflare or cloudflared.

Any information?

2

My case matches the below issue.
https://github.com/cloudflare/cloudflared/issues/698

I will watch Cloudflare updates.

3

Have you checked if the service that the tunnel connects to doesn’t fail or restart?
In my case, I use PM2 to keep alive Node server permanently.

4

Thanks @adaptive.
I have already checked the connection between cloudflared and backend service.
I am running cloudflared and backend service in Kubernetes.
However, I couldn’t see any trace of apps, nodes and Kubernetes components.